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Tonometry2012

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Perkins hand held tonometer<br />

•Endpoint operation of the instrument is the same as the<br />

Goldmann<br />

•doubling prism is used to observe two split semi-circles<br />

and a thumbwheel is used to align the fluorescein mires<br />

for an IOP measurement.<br />

•An advantages of this type of Goldmann tonometer is<br />

that it can be used in any position.<br />

•Has been calibrated for sheep, cattle, dogs and cats<br />

•Relies on a clear regular cornea<br />

•Maximal scale reading = 5 ( maximal IOP ≤ 50mmHg)

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